[sdiy] Imperfect VCO

[Scott Gravenhorst]

Hmm.  What I'm thinking about is waveshaping using some distortion producing
element, such as an OTA with no diode bias and a large input signal, or a 4069
"linear" amplifier to warp the ramp.  My hope is that I can get a fairly good
amount of distortion by subtracting the original waveform.  For simplicity, I
thought I'd use an LC circuit to make some ringing from the reset transient. 
It would be nice if the ring generator could be made frequency voltage
controlled.  Can a VC state variable filter do this (make freq VC ringing)? 
These signals could then be mixed with a VC mixer.

"Michael Ruberto" <frankentron at hotmail.com> wrote:
>What about waveshaping synthesis? altering the amplitude of the wave based 
>on a transfer function which changes the wave based on the overall amplitude 
>at the input. of course it will create the same ugly curcumstance I had with 
>Aztec and it's amplitude eating but there is always a work-around.
>
>My geeky synthesis book explains this as thus "Waveshaping is the distortion 
>of the amplitude of a sound in order to produce an alteration in it's 
>waveform." as wacky as it might sound I think I could design something that 
>does this. however, PLEASE PREVENT ME FROM REINVENTING THE WHEEL. if you 
>have made this I would LOVE to know about it.
>
>I could also just cop out and buy another Miniwave from Blacet and make some 
>custom EPROMS ;-)
>
>~M
>
>
>>From: harrybissell <harrybissell at prodigy.net>
>>To: Rude 66 <r.lekx at chello.nl>
>>CC: music.maker at gte.net, synth-diy at dropmix.xs4all.nl
>>Subject: Re: [sdiy] Imperfect VCO
>>Date: Wed, 30 Jul 2003 22:25:46 -0400
>>
>>Imperfectionizer ???
>>
>>Great idea for a BBD !!!
>>
>>(except the circuitry will be pretty complex to get it only fairly 
>>imperfect)
>>
>>:^P
>>
>>H^) harry
>>
>>Rude 66 wrote:
>>
>> > >
>> > > An "Imperfectionizer"...
>> > >
>> > > Any schematics?  Ideas?
>> >
>> > some instruments react very well to lowering the amount of power. it's 
>>used
>> > in circuit bending and with he guitar pedals crowd.. this might not work 
>>on
>> > 'normal' synths or modules, but maybe on ones with a wall wart for 
>>power.
>> > it's even named as a tb303-trick to get some whacky patterns.
>> > or buy a crumar bit one, the old keyboard version. 90% of these i've 
>>seen
>> > have 'problems' with the parameters, resulting in impossible values, 
>>which
>> > creates some crazy sounds. almost empty memopry batteries will do the 
>>same
>> > with patches on a synth..
>> >
>> > ruud
>> >
>> > www.bunker-records.com/rude66
>>
>
>_________________________________________________________________
>Tired of spam? Get advanced junk mail protection with MSN 8. 
>http://join.msn.com/?page=features/junkmail
>

=========================================================  
- Hydrogen is pointless without solar.
- Good or bad, that which gets rewarded, gets done.
- What good are laws that only lawyers understand?
- The media's credibility should always be questioned.
- Governments do nothing well, save collect taxes.

-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
-- Linux Rex         | RedWebMail by RedStarWare
-- FatMan: home1.gte.net/res0658s/FatMan/
-- NonFatMan: home1.gte.net/res0658s/electronics/